Australia has blocked Huawei Technologies of China from bidding on
contracts in the $38 billion Australian National Broadband Network,
citing security concerns, Huawei said Monday.

“We were informed by the government that there is no role for Huawei” in
the network, said Jeremy Mitchell, a spokesman in Australia for Huawei,
one of the world’s largest suppliers of telecommunications equipment.

The Australian plan is the largest infrastructure project in the
country’s history. It is intended to connect 93 percent of homes and
workplaces with fiber-optic cable, providing broadband service in urban
and rural areas.

It was announced in 2009 by the Australian government with a committed
investment of as much as $38 billion. The network is expected to be
ready by 2020.

The Australian Financial Review newspaper said in a report Monday that
Huawei had sought to secure a supply contract worth as much as 1 billion
Australian dollars, or $1.05 billion, as part of the project, but had
been blocked by the Australian attorney general on the basis of advice
from the Australian Security Intelligence Organization.

The office of the attorney general said in a news release, “This is
consistent with the government’s practice for ensuring the security and
resilience of Australia’s critical infrastructure more broadly.”

The network is “a strategic and significant government investment,” the
attorney general’s office told Bloomberg News. “We have a responsibility
to do our utmost to protect its integrity and that of the information
carried on it.”

The government declined to comment on its specific discussions with companies, which are confidential, the office said.

The security agency declined to comment on the report.

On the sidelines of a nuclear security summit meeting in South Korea,
Prime Minister Julia Gillard of Australia said the government had made
the correct decision.

“You would expect as a government that we make all of the prudent
decisions to make sure that the infrastructure project does what we want
it to do, and we’ve taken one of those decisions,” she said.

Huawei was founded by its chief executive, Ren Zhengfei, a former
officer of the People’s Liberation Army in China. That has led to claims
that it has too cozy a relationship with the Chinese government.

The company. based in Shenzhen, China, has been struggling to expand its
business in the United States, which has blocked its equipment deals,
citing national security concerns and allegations that Huawei had
violated sanctions by supplying Iran with banned equipment.

“While we’re obviously disappointed by the decision,” the company said,
referring to the Australian rejection, “Huawei will continue to be open
and transparent and work to find ways of providing assurance around the
security of our technology.”

Mr. Mitchell told the Australian Broadcasting Corp.: “We have never been
told by the Chinese government to do a certain thing. If we would, that
would be to our detriment, and we would lose the market share that we
have.”

A former Australian foreign minister, Alexander Downer, who is an
independent director on the board of Huawei’s Australian unit, rejected
the government’s security concerns.

“This sort of whole concept of Huawei being involved in cyberwarfare,
presumably that would just be based on the fact that the company comes
from China,” he said on ABC Radio on Monday. “This is just completely
absurd.”

Mr. Mitchell told Bloomberg that “the bar is set higher” for the company because of where it is from.

He said Huawei was working on eight broadband networks similar to the
Australian plan in Benin, Britain, Brunei, Cameroon, Malaysia, New
Zealand, Singapore and the United Arab Emirates.